Google Earth is fascinating.
I love how you can enter any destination in the world, and within seconds your desired image appears.
Recently, British researcher William Lindesay was scanning through images and discovered a new section of The Great Wall of China in the Gobi Desert in Mongolia.
He had been looking for this lost part of the Great Wall since 1997, when he saw a 12th century atlas showing Gengis Khan's battles.
A retired Mongolian geographer told William to look on Google Earth.
William found a very promising faint line that he thought could be the wall, and he set off on an expedition to the desert.
"We reached it on the middle of the second day," he said.
Carbon testing has confirmed that the 62 mile section of wall, made of dirt and branches, has been standing since the 11th or 12th century.